[AArch64] Only build & test pauth code for LP64

gcc/
	* config/aarch64/aarch64-builtins.c (aarch64_init_builtins): Register
	register pauth builtins for LP64 only.

libgcc/
	* config/aarch64/aarch64-unwind.h: Empty this file on ILP32.
	* unwind-dw2.c (execute_cfa_program):  Only multiplexing
	DW_CFA_GNU_window_save for AArch64 and LP64.

gcc/testsuite/
	* testsuite/gcc.target/aarch64/return_address_sign_1.c: Enable on LP64
	only.
	* testsuite/gcc.target/aarch64/return_address_sign_2.c: Likewise.
	* testsuite/gcc.target/aarch64/return_address_sign_3.c: Likewise.

From-SVN: r244732

6 files changed, 23 insertions, 3 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 67ccfa8..10a6978 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2017-01-20  Jiong Wang  <jiong.wang@arm.com>
+
+	* config/aarch64/aarch64-builtins.c (aarch64_init_builtins): Register
+	register pauth builtins for LP64 only.
+
 2017-01-20  Marek Polacek  <polacek@redhat.com>
 
 	PR c/79152
diff --git a/gcc/config/aarch64/aarch64-builtins.c b/gcc/config/aarch64/aarch64-builtins.c
index 6c6530c..f09399f 100644
--- a/gcc/config/aarch64/aarch64-builtins.c
+++ b/gcc/config/aarch64/aarch64-builtins.c
@@ -983,9 +983,14 @@ aarch64_init_builtins (void)
   aarch64_init_crc32_builtins ();
   aarch64_init_builtin_rsqrt ();
 
-/* Initialize pointer authentication builtins which are backed by instructions
-   in NOP encoding space.  */
-  aarch64_init_pauth_hint_builtins ();
+  /* Initialize pointer authentication builtins which are backed by instructions
+     in NOP encoding space.
+
+     NOTE: these builtins are supposed to be used by libgcc unwinder only, as
+     there is no support on return address signing under ILP32, we don't
+     register them.  */
+  if (!TARGET_ILP32)
+    aarch64_init_pauth_hint_builtins ();
 }
 
 tree
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index dbbe345..292731d 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,10 @@
+2017-01-20  Jiong Wang  <jiong.wang@arm.com>
+
+	* testsuite/gcc.target/aarch64/return_address_sign_1.c: Enable on LP64
+	only.
+	* testsuite/gcc.target/aarch64/return_address_sign_2.c: Likewise.
+	* testsuite/gcc.target/aarch64/return_address_sign_3.c: Likewise.
+
 2017-01-20  Nathan Sidwell  <nathan@acm.org>
 
 	PR c++/79495
diff --git a/gcc/testsuite/gcc.target/aarch64/return_address_sign_1.c b/gcc/testsuite/gcc.target/aarch64/return_address_sign_1.c
index fda72a4..f87c3d2 100644
--- a/gcc/testsuite/gcc.target/aarch64/return_address_sign_1.c
+++ b/gcc/testsuite/gcc.target/aarch64/return_address_sign_1.c
@@ -1,6 +1,7 @@
 /* Testing return address signing where no combined instructions used.  */
 /* { dg-do compile } */
 /* { dg-options "-O2 -msign-return-address=all" } */
+/* { dg-require-effective-target lp64 } */
 
 int foo (int);
 
diff --git a/gcc/testsuite/gcc.target/aarch64/return_address_sign_2.c b/gcc/testsuite/gcc.target/aarch64/return_address_sign_2.c
index 54fe47a..c5c1439 100644
--- a/gcc/testsuite/gcc.target/aarch64/return_address_sign_2.c
+++ b/gcc/testsuite/gcc.target/aarch64/return_address_sign_2.c
@@ -1,6 +1,7 @@
 /* Testing return address signing where combined instructions used.  */
 /* { dg-do compile } */
 /* { dg-options "-O2 -msign-return-address=all" } */
+/* { dg-require-effective-target lp64 } */
 
 int foo (int);
 int bar (int, int);
diff --git a/gcc/testsuite/gcc.target/aarch64/return_address_sign_3.c b/gcc/testsuite/gcc.target/aarch64/return_address_sign_3.c
index adc5eff..7d9ec6e 100644
--- a/gcc/testsuite/gcc.target/aarch64/return_address_sign_3.c
+++ b/gcc/testsuite/gcc.target/aarch64/return_address_sign_3.c
@@ -1,6 +1,7 @@
 /* Testing the disable of return address signing.  */
 /* { dg-do compile } */
 /* { dg-options "-O2 -msign-return-address=all" } */
+/* { dg-require-effective-target lp64 } */
 
 int bar (int, int);